Content Mixing

ABSTRACT

In one aspect, a first playback device is configured to: (i) play back first audio content in synchrony with a second playback device, (ii) receive, via a network interface, a message indicating second audio content to be output by the first playback device, and (iii) in response to receiving the message indicating the second audio content: (a) cease playing back the first audio content in synchrony with the second playback device; (b) play back the second audio content while the second playback device plays back the first audio content; and (c) after playing back the second audio content, resume playing back the first audio content in synchrony with the second playback device.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of priority under 35 U.S.C. § 120, and is a continuation of, U.S. patent application Ser. No. 15/098,760 filed on Apr. 14, 2016 and entitled “CONTENT MIXING,” the contents of which are herein incorporated by reference in their entirety. This application claims the benefit of priority under 35 USC § 119(e) to U.S. Provisional Application Ser. No. 62/298,410 filed on Feb. 22, 2016 and entitled “DEFAULT PLAYBACK DEVICE(S)”, U.S. Provisional Application Ser. No. 62/298,418 filed on Feb. 22, 2016 and entitled “AUDIO RESPONSE PLAYBACK”, U.S. Provisional Application Ser. No. 62/298,433 filed on Feb. 22, 2016 and entitled “ROOM-CORRECTED VOICE DETECTION”, U.S. Provisional Application Ser. No. 62/298,439 filed on Feb. 22, 2016 and entitled “CONTENT MIXING”, U.S. Provisional Application Ser. No. 62/298,425 filed on Feb. 22, 2016 and entitled “MUSIC SERVICE SELECTION”, U.S. Provisional Application Ser. No. 62/298,350 filed on Feb. 22, 2016 and entitled “METADATA EXCHANGE INVOLVING A NETWORKED PLAYBACK SYSTEM AND A NETWORKED MICROPHONE SYSTEM”, U.S. Provisional Application Ser. No. 62/298,388 filed on Feb. 22, 2016 and entitled “HANDLING OF LOSS OF PAIRING BETWEEN NETWORKED DEVICES”, U.S. Provisional Application Ser. No. 62/298,393 filed on Feb. 22, 2016 and entitled “ACTION BASED ON USER ID”, U.S. Provisional Application Ser. No. 62/312,350 filed on Mar. 23, 2016 and entitled “VOICE CONTROL OF A MEDIA PLAYBACK SYSTEM”, the contents each of which are herein incorporated by reference in their entireties.

FIELD OF THE DISCLOSURE

The disclosure is related to consumer goods and, more particularly, to methods, systems, products, features, services, and other elements directed to media playback or some aspect thereof.

BACKGROUND

Options for accessing and listening to digital audio in an out-loud setting were limited until in 2003, when SONOS, Inc. filed for one of its first patent applications, entitled “Method for Synchronizing Audio Playback between Multiple Networked Devices,” and began offering a media playback system for sale in 2005. The Sonos Wireless HiFi System enables people to experience music from many sources via one or more networked playback devices. Through a software control application installed on a smartphone, tablet, or computer, one can play audio in any room that has a networked playback device. Additionally, using the control device, for example, different songs can be streamed to each room with a playback device, rooms can be grouped together for synchronous playback, or the same song can be heard in all rooms synchronously.

Given the ever growing interest in digital media, there continues to be a need to develop consumer-accessible technologies to further enhance the listening experience.

BRIEF DESCRIPTION OF THE DRAWINGS

Features, aspects, and advantages of the presently disclosed technology may be better understood with regard to the following description, appended claims, and accompanying drawings where:

FIG. 1 shows an example playback system configuration in which certain embodiments may be practiced;

FIG. 2 shows a functional block diagram of an example playback device;

FIG. 3 shows a functional block diagram of an example control device;

FIG. 4 shows an example control device interface;

FIG. 5 shows an example network configuration in which certain embodiments may be practiced;

FIG. 6 shows a functional block diagram of an example network microphone device;

FIG. 7 is an example flow diagram related to a playback device adjusting of volume of audio content in the presence of content output; and

FIG. 8 is another example flow diagram related to playback of content output and/or audio content by a playback device.

The drawings are for the purpose of illustrating example embodiments, but it is understood that the embodiments are not limited to the arrangements and instrumentality shown in the drawings.

DETAILED DESCRIPTION I. Overview

Embodiments described herein involve, inter alia, adjusting a volume for audio content played back by a playback system when content different from the audio content is output by a network microphone device or by the playback system.

The network microphone device (NMD) may be a device which receives voice input via a microphone array and outputs content via a speaker. The voice input may be a query, for example, in the form of human speech and the content output may be a response to the query. The voice input may be in the form of human speech and the content output may take a variety of forms including voice output, a tone, an alarm, or music responsive to the voice input. The content output by a network microphone device may be referred to herein as NMD output.

As an example, the network microphone device may receive a voice input spoken as “Who is ‘Artist 1’ of ‘Track 1’ from ‘Streaming Service 1’. The network microphone device may determine that the voice input is a command, and then provide a voice output in response to the voice input. The voice output may be a spoken response that identifies the Artist (e.g., Prince) queried in the voice input.

In many situations, the network microphone device may be placed in proximity to a media playback system. The media playback system may include a plurality of playback devices that play back audio content. These playback devices may be distributed in various locations within a home, and these locations may be referred to as zones such as a bedroom or living room. The playback devices may be playing back audio content at the same time a network microphone device outputs content. As a result, the content output from the network microphone device might not be heard while the audio content is also playing.

In one embodiment, the playback device may be arranged to decrease its volume to a level below that of a volume that the network microphone device would use when the network microphone device outputs the content. This way a listener may be able to better hear the content output from the network microphone device. The process of decreasing volume of a playback device to below a volume of another content may be referred to herein as ducking.

The playback devices that are ducked may be all of the playback devices in the media playback system. In another example, the media playback devices that are ducked may be a subset of the playback devices. The subset of the playback devices that are ducked may be based on whether the network microphone device is in the same zone or zones. Alternatively, the subset of the playback devices that are ducked may be based on whether the network microphone device is bonded (grouped or paired) with the playback device.

These playback devices which are also playing back audio content may directly impact whether the content output by the network microphone device is heard. For example, if a media playback system has a playback device in a kitchen and in the bedroom and the network microphone device is located in the kitchen, then the kitchen playback device may be bonded with the network microphone device. Both the kitchen playback device and the bedroom playback device may be playing back audio. But when the network microphone device outputs content, the kitchen playback device may be ducked, but the bedroom playback device might not be ducked. But if the environment in which the playback devices is operating is an open area having with different zones, all of the playback devices in the different zones may still be ducked. Otherwise, the content output from the network microphone device may be still difficult to hear in the open area.

In other embodiments, the playback device itself may play back the NMD content. Given that the playback device may also be playing audio content, e.g., music, the playback device may output the NMD content in a variety of ways. As one example, the playback device may be arranged to receive an indication of the NMD content from the network microphone device and mix the NMD content with the audio content played by the playback device. As another example, the audio content being played back may be muted and the NMD content may be output on a playback device. As yet another example, the audio content being played back may be paused and the NMD content may be output on a playback device. Other arrangements are also possible.

II. Example Operating Environment

FIG. 1 shows an example configuration of a media playback system 100 in which one or more embodiments disclosed herein may be practiced or implemented. The media playback system 100 as shown is associated with an example home environment having several rooms and spaces, such as for example, a master bedroom, an office, a dining room, and a living room. As shown in the example of FIG. 1, the media playback system 100 includes playback devices 102-124, control devices 126 and 128, and a wired or wireless network router 130.

Further discussions relating to the different components of the example media playback system 100 and how the different components may interact to provide a user with a media experience may be found in the following sections. While discussions herein may generally refer to the example media playback system 100, technologies described herein are not limited to applications within, among other things, the home environment as shown in FIG. 1. For instance, the technologies described herein may be useful in environments where multi-zone audio may be desired, such as, for example, a commercial setting like a restaurant, mall or airport, a vehicle like a sports utility vehicle (SUV), bus or car, a ship or boat, an airplane, and so on.

a. Example Playback Devices

FIG. 2 shows a functional block diagram of an example playback device 200 that may be configured to be one or more of the playback devices 102-124 of the media playback system 100 of FIG. 1. The playback device 200 may include a processor 202, software components 204, memory 206, audio processing components 208, audio amplifier(s) 210, speaker(s) 212, a network interface 214 including wireless interface(s) 216 and wired interface(s) 218, and microphone(s) 220. In one case, the playback device 200 may not include the speaker(s) 212, but rather a speaker interface for connecting the playback device 200 to external speakers. In another case, the playback device 200 may include neither the speaker(s) 212 nor the audio amplifier(s) 210, but rather an audio interface for connecting the playback device 200 to an external audio amplifier or audio-visual receiver.

In one example, the processor 202 may be a clock-driven computing component configured to process input data according to instructions stored in the memory 206. The memory 206 may be a tangible computer-readable medium configured to store instructions executable by the processor 202. For instance, the memory 206 may be data storage that can be loaded with one or more of the software components 204 executable by the processor 202 to achieve certain functions. In one example, the functions may involve the playback device 200 retrieving audio data from an audio source or another playback device. In another example, the functions may involve the playback device 200 sending audio data to another device or playback device on a network. In yet another example, the functions may involve pairing of the playback device 200 with one or more playback devices to create a multi-channel audio environment.

Certain functions may involve the playback device 200 synchronizing playback of audio content with one or more other playback devices. During synchronous playback, a listener will preferably not be able to perceive time-delay differences between playback of the audio content by the playback device 200 and the one or more other playback devices. U.S. Pat. No. 8,234,395 entitled, “System and method for synchronizing operations among a plurality of independently clocked digital data processing devices,” which is hereby incorporated by reference, provides in more detail some examples for audio playback synchronization among playback devices.

The memory 206 may further be configured to store data associated with the playback device 200, such as one or more zones and/or zone groups the playback device 200 is a part of, audio sources accessible by the playback device 200, or a playback queue that the playback device 200 (or some other playback device) may be associated with. The data may be stored as one or more state variables that are periodically updated and used to describe the state of the playback device 200. The memory 206 may also include the data associated with the state of the other devices of the media system, and shared from time to time among the devices so that one or more of the devices have the most recent data associated with the system. Other embodiments are also possible.

The audio processing components 208 may include one or more digital-to-analog converters (DAC), an audio preprocessing component, an audio enhancement component or a digital signal processor (DSP), and so on. In one embodiment, one or more of the audio processing components 208 may be a subcomponent of the processor 202. In one example, audio content may be processed and/or intentionally altered by the audio processing components 208 to produce audio signals. The produced audio signals may then be provided to the audio amplifier(s) 210 for amplification and playback through speaker(s) 212. Particularly, the audio amplifier(s) 210 may include devices configured to amplify audio signals to a level for driving one or more of the speakers 212. The speaker(s) 212 may include an individual transducer (e.g., a “driver”) or a complete speaker system involving an enclosure with one or more drivers. A particular driver of the speaker(s) 212 may include, for example, a subwoofer (e.g., for low frequencies), a mid-range driver (e.g., for middle frequencies), and/or a tweeter (e.g., for high frequencies). In some cases, each transducer in the one or more speakers 212 may be driven by an individual corresponding audio amplifier of the audio amplifier(s) 210. In addition to producing analog signals for playback by the playback device 200, the audio processing components 208 may be configured to process audio content to be sent to one or more other playback devices for playback.

Audio content to be processed and/or played back by the playback device 200 may be received from an external source, such as via an audio line-in input connection (e.g., an auto-detecting 3.5 mm audio line-in connection) or the network interface 214.

The network interface 214 may be configured to facilitate a data flow between the playback device 200 and one or more other devices on a data network. As such, the playback device 200 may be configured to receive audio content over the data network from one or more other playback devices in communication with the playback device 200, network devices within a local area network, or audio content sources over a wide area network such as the Internet. In one example, the audio content and other signals transmitted and received by the playback device 200 may be transmitted in the form of digital packet data containing an Internet Protocol (IP)-based source address and IP-based destination addresses. In such a case, the network interface 214 may be configured to parse the digital packet data such that the data destined for the playback device 200 is properly received and processed by the playback device 200.

As shown, the network interface 214 may include wireless interface(s) 216 and wired interface(s) 218. The wireless interface(s) 216 may provide network interface functions for the playback device 200 to wirelessly communicate with other devices (e.g., other playback device(s), speaker(s), receiver(s), network device(s), control device(s) within a data network the playback device 200 is associated with) in accordance with a communication protocol (e.g., any wireless standard including IEEE 802.11a, 802.11b, 802.11g, 802.11n, 802.11ac, 802.15, 4G mobile communication standard, and so on). The wired interface(s) 218 may provide network interface functions for the playback device 200 to communicate over a wired connection with other devices in accordance with a communication protocol (e.g., IEEE 802.3). While the network interface 214 shown in FIG. 2 includes both wireless interface(s) 216 and wired interface(s) 218, the network interface 214 may in some embodiments include only wireless interface(s) or only wired interface(s).

The microphone(s) 220 may be arranged to detect sound in the environment of the playback device 200. For instance, the microphone(s) may be mounted on an exterior wall of a housing of the playback device. The microphone(s) may be any type of microphone now known or later developed such as a condenser microphone, electret condenser microphone, or a dynamic microphone. The microphone(s) may be sensitive to a portion of the frequency range of the speaker(s) 220. One or more of the speaker(s) 220 may operate in reverse as the microphone(s) 220. In some aspects, the playback device 200 might not have microphone(s) 220.

In one example, the playback device 200 and one other playback device may be paired to play two separate audio components of audio content. For instance, playback device 200 may be configured to play a left channel audio component, while the other playback device may be configured to play a right channel audio component, thereby producing or enhancing a stereo effect of the audio content. The paired playback devices (also referred to as “bonded playback devices”) may further play audio content in synchrony with other playback devices.

In another example, the playback device 200 may be sonically consolidated with one or more other playback devices to form a single, consolidated playback device. A consolidated playback device may be configured to process and reproduce sound differently than an unconsolidated playback device or playback devices that are paired, because a consolidated playback device may have additional speaker drivers through which audio content may be rendered. For instance, if the playback device 200 is a playback device designed to render low frequency range audio content (i.e. a subwoofer), the playback device 200 may be consolidated with a playback device designed to render full frequency range audio content. In such a case, the full frequency range playback device, when consolidated with the low frequency playback device 200, may be configured to render only the mid and high frequency components of audio content, while the low frequency range playback device 200 renders the low frequency component of the audio content. The consolidated playback device may further be paired with a single playback device or yet another consolidated playback device.

By way of illustration, SONOS, Inc. presently offers (or has offered) for sale certain playback devices including a “PLAY:1,” “PLAY:3,” “PLAY:5,” “PLAYBAR,” “CONNECT:AMP,” “CONNECT,” and “SUB.” Any other past, present, and/or future playback devices may additionally or alternatively be used to implement the playback devices of example embodiments disclosed herein. Additionally, it is understood that a playback device is not limited to the example illustrated in FIG. 2 or to the SONOS product offerings. For example, a playback device may include a wired or wireless headphone. In another example, a playback device may include or interact with a docking station for personal mobile media playback devices. In yet another example, a playback device may be integral to another device or component such as a television, a lighting fixture, or some other device for indoor or outdoor use.

b. Example Playback Zone Configurations

Referring back to the media playback system 100 of FIG. 1, the environment may have one or more playback zones, each with one or more playback devices. The media playback system 100 may be established with one or more playback zones, after which one or more zones may be added, or removed to arrive at the example configuration shown in FIG. 1. Each zone may be given a name according to a different room or space such as an office, bathroom, master bedroom, bedroom, kitchen, dining room, living room, and/or balcony. In one case, a single playback zone may include multiple rooms or spaces. In another case, a single room or space may include multiple playback zones.

As shown in FIG. 1, the balcony, dining room, kitchen, bathroom, office, and bedroom zones each have one playback device, while the living room and master bedroom zones each have multiple playback devices. In the living room zone, playback devices 104, 106, 108, and 110 may be configured to play audio content in synchrony as individual playback devices, as one or more bonded playback devices, as one or more consolidated playback devices, or any combination thereof. Similarly, in the case of the master bedroom, playback devices 122 and 124 may be configured to play audio content in synchrony as individual playback devices, as a bonded playback device, or as a consolidated playback device.

In one example, one or more playback zones in the environment of FIG. 1 may each be playing different audio content. For instance, the user may be grilling in the balcony zone and listening to hip hop music being played by the playback device 102 while another user may be preparing food in the kitchen zone and listening to classical music being played by the playback device 114. In another example, a playback zone may play the same audio content in synchrony with another playback zone. For instance, the user may be in the office zone where the playback device 118 is playing the same rock music that is being playing by playback device 102 in the balcony zone. In such a case, playback devices 102 and 118 may be playing the rock music in synchrony such that the user may seamlessly (or at least substantially seamlessly) enjoy the audio content that is being played out-loud while moving between different playback zones. Synchronization among playback zones may be achieved in a manner similar to that of synchronization among playback devices, as described in previously referenced U.S. Pat. No. 8,234,395.

As suggested above, the zone configurations of the media playback system 100 may be dynamically modified, and in some embodiments, the media playback system 100 supports numerous configurations. For instance, if a user physically moves one or more playback devices to or from a zone, the media playback system 100 may be reconfigured to accommodate the change(s). For instance, if the user physically moves the playback device 102 from the balcony zone to the office zone, the office zone may now include both the playback device 118 and the playback device 102. The playback device 102 may be paired or grouped with the office zone and/or renamed if so desired via a control device such as the control devices 126 and 128. On the other hand, if the one or more playback devices are moved to a particular area in the home environment that is not already a playback zone, a new playback zone may be created for the particular area.

Further, different playback zones of the media playback system 100 may be dynamically combined into zone groups or split up into individual playback zones. For instance, the dining room zone and the kitchen zone 114 may be combined into a zone group for a dinner party such that playback devices 112 and 114 may render audio content in synchrony. On the other hand, the living room zone may be split into a television zone including playback device 104, and a listening zone including playback devices 106, 108, and 110, if the user wishes to listen to music in the living room space while another user wishes to watch television.

c. Example Control Devices

FIG. 3 shows a functional block diagram of an example control device 300 that may be configured to be one or both of the control devices 126 and 128 of the media playback system 100. As shown, the control device 300 may include a processor 302, memory 304, a network interface 306, a user interface 308, microphone(s) 310, and software components 312. In one example, the control device 300 may be a dedicated controller for the media playback system 100. In another example, the control device 300 may be a network device on which media playback system controller application software may be installed, such as for example, an iPhone™, iPad™ or any other smart phone, tablet or network device (e.g., a networked computer such as a PC or Mac™).

The processor 302 may be configured to perform functions relevant to facilitating user access, control, and configuration of the media playback system 100. The memory 304 may be data storage that can be loaded with one or more of the software components executable by the processor 302 to perform those functions. The memory 304 may also be configured to store the media playback system controller application software and other data associated with the media playback system 100 and the user.

In one example, the network interface 306 may be based on an industry standard (e.g., infrared, radio, wired standards including IEEE 802.3, wireless standards including IEEE 802.11a, 802.11b, 802.11g, 802.11n, 802.11ac, 802.15, 4G mobile communication standard, and so on). The network interface 306 may provide a means for the control device 300 to communicate with other devices in the media playback system 100. In one example, data and information (e.g., such as a state variable) may be communicated between control device 300 and other devices via the network interface 306. For instance, playback zone and zone group configurations in the media playback system 100 may be received by the control device 300 from a playback device or another network device, or transmitted by the control device 300 to another playback device or network device via the network interface 306. In some cases, the other network device may be another control device.

Playback device control commands such as volume control and audio playback control may also be communicated from the control device 300 to a playback device via the network interface 306. As suggested above, changes to configurations of the media playback system 100 may also be performed by a user using the control device 300. The configuration changes may include adding/removing one or more playback devices to/from a zone, adding/removing one or more zones to/from a zone group, forming a bonded or consolidated player, separating one or more playback devices from a bonded or consolidated player, among others. Accordingly, the control device 300 may sometimes be referred to as a controller, whether the control device 300 is a dedicated controller or a network device on which media playback system controller application software is installed.

Control device 300 may include microphone(s) 310. Microphone(s) 310 may be arranged to detect sound in the environment of the control device 300. Microphone(s) 310 may be any type of microphone now known or later developed such as a condenser microphone, electret condenser microphone, or a dynamic microphone. The microphone(s) may be sensitive to a portion of a frequency range. Two or more microphones 310 may be arranged to capture location information of an audio source (e.g., voice, audible sound) and/or to assist in filtering background noise.

The user interface 308 of the control device 300 may be configured to facilitate user access and control of the media playback system 100, by providing a controller interface such as the controller interface 400 shown in FIG. 4. The controller interface 400 includes a playback control region 410, a playback zone region 420, a playback status region 430, a playback queue region 440, and an audio content sources region 450. The user interface 400 as shown is just one example of a user interface that may be provided on a network device such as the control device 300 of FIG. 3 (and/or the control devices 126 and 128 of FIG. 1) and accessed by users to control a media playback system such as the media playback system 100. Other user interfaces of varying formats, styles, and interactive sequences may alternatively be implemented on one or more network devices to provide comparable control access to a media playback system.

The playback control region 410 may include selectable (e.g., by way of touch or by using a cursor) icons to cause playback devices in a selected playback zone or zone group to play or pause, fast forward, rewind, skip to next, skip to previous, enter/exit shuffle mode, enter/exit repeat mode, enter/exit cross fade mode. The playback control region 410 may also include selectable icons to modify equalization settings, and playback volume, among other possibilities.

The playback zone region 420 may include representations of playback zones within the media playback system 100. In some embodiments, the graphical representations of playback zones may be selectable to bring up additional selectable icons to manage or configure the playback zones in the media playback system, such as a creation of bonded zones, creation of zone groups, separation of zone groups, and renaming of zone groups, among other possibilities.

For example, as shown, a “group” icon may be provided within each of the graphical representations of playback zones. The “group” icon provided within a graphical representation of a particular zone may be selectable to bring up options to select one or more other zones in the media playback system to be grouped with the particular zone. Once grouped, playback devices in the zones that have been grouped with the particular zone will be configured to play audio content in synchrony with the playback device(s) in the particular zone. Analogously, a “group” icon may be provided within a graphical representation of a zone group. In this case, the “group” icon may be selectable to bring up options to deselect one or more zones in the zone group to be removed from the zone group. Other interactions and implementations for grouping and ungrouping zones via a user interface such as the user interface 400 are also possible. The representations of playback zones in the playback zone region 420 may be dynamically updated as playback zone or zone group configurations are modified.

The playback status region 430 may include graphical representations of audio content that is presently being played, previously played, or scheduled to play next in the selected playback zone or zone group. The selected playback zone or zone group may be visually distinguished on the user interface, such as within the playback zone region 420 and/or the playback status region 430. The graphical representations may include track title, artist name, album name, album year, track length, and other relevant information that may be useful for the user to know when controlling the media playback system via the user interface 400.

The playback queue region 440 may include graphical representations of audio content in a playback queue associated with the selected playback zone or zone group. In some embodiments, each playback zone or zone group may be associated with a playback queue containing information corresponding to zero or more audio items for playback by the playback zone or zone group. For instance, each audio item in the playback queue may comprise a uniform resource identifier (URI), a uniform resource locator (URL) or some other identifier that may be used by a playback device in the playback zone or zone group to find and/or retrieve the audio item from a local audio content source or a networked audio content source, possibly for playback by the playback device.

In one example, a playlist may be added to a playback queue, in which case information corresponding to each audio item in the playlist may be added to the playback queue. In another example, audio items in a playback queue may be saved as a playlist. In a further example, a playback queue may be empty, or populated but “not in use” when the playback zone or zone group is playing continuously streaming audio content, such as Internet radio that may continue to play until otherwise stopped, rather than discrete audio items that have playback durations. In an alternative embodiment, a playback queue can include Internet radio and/or other streaming audio content items and be “in use” when the playback zone or zone group is playing those items. Other examples are also possible.

When playback zones or zone groups are “grouped” or “ungrouped,” playback queues associated with the affected playback zones or zone groups may be cleared or re-associated. For example, if a first playback zone including a first playback queue is grouped with a second playback zone including a second playback queue, the established zone group may have an associated playback queue that is initially empty, that contains audio items from the first playback queue (such as if the second playback zone was added to the first playback zone), that contains audio items from the second playback queue (such as if the first playback zone was added to the second playback zone), or a combination of audio items from both the first and second playback queues. Subsequently, if the established zone group is ungrouped, the resulting first playback zone may be re-associated with the previous first playback queue, or be associated with a new playback queue that is empty or contains audio items from the playback queue associated with the established zone group before the established zone group was ungrouped. Similarly, the resulting second playback zone may be re-associated with the previous second playback queue, or be associated with a new playback queue that is empty, or contains audio items from the playback queue associated with the established zone group before the established zone group was ungrouped. Other examples are also possible.

Referring back to the user interface 400 of FIG. 4, the graphical representations of audio content in the playback queue region 440 may include track titles, artist names, track lengths, and other relevant information associated with the audio content in the playback queue. In one example, graphical representations of audio content may be selectable to bring up additional selectable icons to manage and/or manipulate the playback queue and/or audio content represented in the playback queue. For instance, a represented audio content may be removed from the playback queue, moved to a different position within the playback queue, or selected to be played immediately, or after any currently playing audio content, among other possibilities. A playback queue associated with a playback zone or zone group may be stored in a memory on one or more playback devices in the playback zone or zone group, on a playback device that is not in the playback zone or zone group, and/or some other designated device.

The audio content sources region 450 may include graphical representations of selectable audio content sources from which audio content may be retrieved and played by the selected playback zone or zone group. Discussions pertaining to audio content sources may be found in the following section.

d. Example Audio Content Sources

As indicated previously, one or more playback devices in a zone or zone group may be configured to retrieve for playback audio content (e.g. according to a corresponding URI or URL for the audio content) from a variety of available audio content sources. In one example, audio content may be retrieved by a playback device directly from a corresponding audio content source (e.g., a line-in connection). In another example, audio content may be provided to a playback device over a network via one or more other playback devices or network devices.

Example audio content sources may include a memory of one or more playback devices in a media playback system such as the media playback system 100 of FIG. 1, local music libraries on one or more network devices (such as a control device, a network-enabled personal computer, or a networked-attached storage (NAS), for example), streaming audio services providing audio content via the Internet (e.g., the cloud), or audio sources connected to the media playback system via a line-in input connection on a playback device or network devise, among other possibilities.

In some embodiments, audio content sources may be regularly added or removed from a media playback system such as the media playback system 100 of FIG. 1. In one example, an indexing of audio items may be performed whenever one or more audio content sources are added, removed or updated. Indexing of audio items may involve scanning for identifiable audio items in all folders/directory shared over a network accessible by playback devices in the media playback system, and generating or updating an audio content database containing metadata (e.g., title, artist, album, track length, among others) and other associated information, such as a URI or URL for each identifiable audio item found. Other examples for managing and maintaining audio content sources may also be possible.

The above discussions relating to playback devices, controller devices, playback zone configurations, and media content sources provide only some examples of operating environments within which functions and methods described below may be implemented. Other operating environments and configurations of media playback systems, playback devices, and network devices not explicitly described herein may also be applicable and suitable for implementation of the functions and methods.

e. Example Plurality of Networked Devices

FIG. 5 shows an example plurality of devices 500 that may be configured to provide an audio playback experience based on voice control. One having ordinary skill in the art will appreciate that the devices shown in FIG. 5 are for illustrative purposes only, and variations including different and/or additional devices may be possible. As shown, the plurality of devices 500 includes computing devices 504, 506, and 508; network microphone devices (NMDs) 512, 514, and 516; playback devices (PBDs) 532, 534, 536, and 538; and a controller device (CR) 522.

Each of the plurality of devices 500 may be network-capable devices that can establish communication with one or more other devices in the plurality of devices according to one or more network protocols, such as NFC, Bluetooth, Ethernet, and IEEE 802.11, among other examples, over one or more types of networks, such as wide area networks (WAN), local area networks (LAN), and personal area networks (PAN), among other possibilities.

As shown, the computing devices 504, 506, and 508 may be part of a cloud network 502. The cloud network 502 may include additional computing devices. In one example, the computing devices 504, 506, and 508 may be different servers. In another example, two or more of the computing devices 504, 506, and 508 may be modules of a single server. Analogously, each of the computing device 504, 506, and 508 may include one or more modules or servers. For ease of illustration purposes herein, each of the computing devices 504, 506, and 508 may be configured to perform particular functions within the cloud network 502. For instance, computing device 508 may be a source of audio content for a streaming music service.

As shown, the computing device 504 may be configured to interface with NMDs 512, 514, and 516 via communication path 542. NMDs 512, 514, and 516 may be components of one or more “Smart Home” systems. In one case, NMDs 512, 514, and 516 may be physically distributed throughout a household, similar to the distribution of devices shown in FIG. 1. In another case, two or more of the NMDs 512, 514, and 516 may be physically positioned within relative close proximity of one another. Communication path 542 may comprise one or more types of networks, such as a WAN including the Internet, LAN, and/or PAN, among other possibilities.

In one example, one or more of the NMDs 512, 514, and 516 may be devices configured primarily for audio detection. In another example, one or more of the NMDs 512, 514, and 516 may be components of devices having various primary utilities. For instance, as discussed above in connection to FIGS. 2 and 3, one or more of NMDs 512, 514, and 516 may be the microphone(s) 220 of playback device 200 or the microphone(s) 310 of network device 300. Further, in some cases, one or more of NMDs 512, 514, and 516 may be the playback device 200 or network device 300. In an example, one or more of NMDs 512, 514, and/or 516 may include multiple microphones arranged in a microphone array.

As shown, the computing device 506 may be configured to interface with CR 522 and PBDs 532, 534, 536, and 538 via communication path 544. In one example, CR 522 may be a network device such as the network device 200 of FIG. 2. Accordingly, CR 522 may be configured to provide the controller interface 400 of FIG. 4. Similarly, PBDs 532, 534, 536, and 538 may be playback devices such as the playback device 300 of FIG. 3. As such, PBDs 532, 534, 536, and 538 may be physically distributed throughout a household as shown in FIG. 1. For illustration purposes, PBDs 536 and 538 may be part of a bonded zone 530, while PBDs 532 and 534 may be part of their own respective zones. As described above, the PBDs 532, 534, 536, and 538 may be dynamically bonded, grouped, unbonded, and ungrouped. Communication path 544 may comprise one or more types of networks, such as a WAN including the Internet, LAN, and/or PAN, among other possibilities.

In one example, as with NMDs 512, 514, and 516, CR 522 and PBDs 532, 534, 536, and 538 may also be components of one or more “Smart Home” systems. In one case, PBDs 532, 534, 536, and 538 may be distributed throughout the same household as the NMDs 512, 514, and 516. Further, as suggested above, one or more of PBDs 532, 534, 536, and 538 may be one or more of NMDs 512, 514, and 516.

The NMDs 512, 514, and 516 may be part of a local area network, and the communication path 542 may include an access point that links the local area network of the NMDs 512, 514, and 516 to the computing device 504 over a WAN (communication path not shown). Likewise, each of the NMDs 512, 514, and 516 may communicate with each other via such an access point.

Similarly, CR 522 and PBDs 532, 534, 536, and 538 may be part of a local area network and/or a local playback network as discussed in previous sections, and the communication path 544 may include an access point that links the local area network and/or local playback network of CR 522 and PBDs 532, 534, 536, and 538 to the computing device 506 over a WAN. As such, each of the CR 522 and PBDs 532, 534, 536, and 538 may also communicate with each over such an access point.

In one example, communication paths 542 and 544 may comprise the same access point. In an example, each of the NMDs 512, 514, and 516, CR 522, and PBDs 532, 534, 536, and 538 may access the cloud network 502 via the same access point for a household.

As shown in FIG. 5, each of the NMDs 512, 514, and 516, CR 522, and PBDs 532, 534, 536, and 538 may also directly communicate with one or more of the other devices via communication means 546. Communication means 546 as described herein may involve one or more forms of communication between the devices, according to one or more network protocols, over one or more types of networks, and/or may involve communication via one or more other network devices. For instance, communication means 546 may include one or more of for example, Bluetooth™ (IEEE 802.15), NFC, Wireless direct, and/or Proprietary wireless, among other possibilities.

In one example, CR 522 may communicate with NMD 512 over Bluetooth™, and communicate with PBD 534 over another local area network. In another example, NMD 514 may communicate with CR 522 over another local area network, and communicate with PBD 536 over Bluetooth. In a further example, each of the PBDs 532, 534, 536, and 538 may communicate with each other according to a spanning tree protocol over a local playback network, while each communicating with CR 522 over a local area network, different from the local playback network. Other examples are also possible.

In some cases, communication means between the NMDs 512, 514, and 516, CR 522, and PBDs 532, 534, 536, and 538 may change depending on types of communication between the devices, network conditions, and/or latency demands. For instance, communication means 546 may be used when NMD 516 is first introduced to the household with the PBDs 532, 534, 536, and 538. In one case, the NMD 516 may transmit identification information corresponding to the NMD 516 to PBD 538 via NFC, and PBD 538 may in response, transmit local area network information to NMD 516 via NFC (or some other form of communication). However, once NMD 516 has been configured within the household, communication means between NMD 516 and PBD 538 may change. For instance, NMD 516 may subsequently communicate with PBD 538 via communication path 542, the cloud network 502, and communication path 544. In another example, the NMDs and PBDs may never communicate via local communications means 546. In a further example, the NMDs and PBDs may communicate primarily via local communications means 546. Other examples are also possible.

In an illustrative example, NMDs 512, 514, and 516 may be configured to receive voice inputs to control PBDs 532, 534, 536, and 538. The available control commands may include any media playback system controls previously discussed, such as playback volume control, playback transport controls, music source selection, and grouping, among other possibilities. In one instance, NMD 512 may receive a voice input to control one or more of the PBDs 532, 534, 536, and 538. In response to receiving the voice input, NMD 512 may transmit via communication path 542, the voice input to computing device 504 for processing. In one example, the computing device 504 may convert the voice input to an equivalent text command, and parse the text command to identify a command. Computing device 504 may then subsequently transmit the text command to the computing device 506. In another example, the computing device 504 may convert the voice input to an equivalent text command, and then subsequently transmit the text command to the computing device 506. The computing device 506 may then parse the text command to identify one or more playback commands.

For instance, if the text command is “Play ‘Track 1’ by ‘Artist 1’ from ‘Streaming Service 1’ in ‘Zone 1’,” The computing device 506 may identify (i) a URL for “Track 1” by “Artist 1” available from “Streaming Service 1,” and (ii) at least one playback device in “Zone 1.” In this example, the URL for “Track 1” by “Artist 1” from “Streaming Service 1” may be a URL pointing to computing device 508, and “Zone 1” may be the bonded zone 530. As such, upon identifying the URL and one or both of PBDs 536 and 538, the computing device 506 may transmit via communication path 544 to one or both of PBDs 536 and 538, the identified URL for playback. One or both of PBDs 536 and 538 may responsively retrieve audio content from the computing device 508 according to the received URL, and begin playing “Track 1” by “Artist 1” from “Streaming Service 1.”

One having ordinary skill in the art will appreciate that the above is just one illustrative example, and that other implementations are also possible. In one case, operations performed by one or more of the plurality of devices 500, as described above, may be performed by one or more other devices in the plurality of device 500. For instance, the conversion from voice input to the text command may be alternatively, partially, or wholly performed by another device or devices, such as NMD 512, computing device 506, PBD 536, and/or PBD 538. Analogously, the identification of the URL may be alternatively, partially, or wholly performed by another device or devices, such as NMD 512, computing device 504, PBD 536, and/or PBD 538.

f. Example Network Microphone Device

FIG. 6 shows a function block diagram of an example network microphone device 600 that may be configured to be one or more of NMDs 512, 514, and 516 of FIG. 5. As shown, the network microphone device 600 includes a processor 602, memory 604, a microphone array 606, a network interface 608, a user interface 610, software components 612, and speaker(s) 614. One having ordinary skill in the art will appreciate that other network microphone device configurations and arrangements are also possible. For instance, network microphone devices may alternatively exclude the speaker(s) 614 or have a single microphone instead of microphone array 606.

The processor 602 may include one or more processors and/or controllers, which may take the form of a general or special-purpose processor or controller. For instance, the processing unit 602 may include microprocessors, microcontrollers, application-specific integrated circuits, digital signal processors, and the like. The memory 604 may be data storage that can be loaded with one or more of the software components executable by the processor 602 to perform those functions. Accordingly, memory 604 may comprise one or more non-transitory computer-readable storage mediums, examples of which may include volatile storage mediums such as random access memory, registers, cache, etc. and non-volatile storage mediums such as read-only memory, a hard-disk drive, a solid-state drive, flash memory, and/or an optical-storage device, among other possibilities.

The microphone array 606 may be a plurality of microphones arranged to detect sound in the environment of the network microphone device 600. Microphone array 606 may include any type of microphone now known or later developed such as a condenser microphone, electret condenser microphone, or a dynamic microphone, among other possibilities. In one example, the microphone array may be arranged to detect audio from one or more directions relative to the network microphone device. The microphone array 606 may be sensitive to a portion of a frequency range. In one example, a first subset of the microphone array 606 may be sensitive to a first frequency range, while a second subset of the microphone array may be sensitive to a second frequency range. The microphone array 606 may further be arranged to capture location information of an audio source (e.g., voice, audible sound) and/or to assist in filtering background noise. Notably, in some embodiments the microphone array may consist of only a single microphone, rather than a plurality of microphones.

The network interface 608 may be configured to facilitate wireless and/or wired communication between various network devices, such as, in reference to FIG. 5, CR 522, PBDs 532-538, computing device 504-508 in cloud network 502, and other network microphone devices, among other possibilities. As such, network interface 608 may take any suitable form for carrying out these functions, examples of which may include an Ethernet interface, a serial bus interface (e.g., FireWire, USB 2.0, etc.), a chipset and antenna adapted to facilitate wireless communication, and/or any other interface that provides for wired and/or wireless communication. In one example, the network interface 608 may be based on an industry standard (e.g., infrared, radio, wired standards including IEEE 802.3, wireless standards including IEEE 802.11a, 802.11b, 802.11g, 802.11n, 802.11ac, 802.15, 4G mobile communication standard, and so on).

The user interface 610 of the network microphone device 600 may be configured to facilitate user interactions with the network microphone device. In one example, the user interface 608 may include one or more of physical buttons, graphical interfaces provided on touch sensitive screen(s) and/or surface(s), among other possibilities, for a user to directly provide input to the network microphone device 600. The user interface 610 may further include one or more of lights and the speaker(s) 614 to provide visual and/or audio feedback to a user. In one example, the network microphone device 600 may further be configured to playback audio content via the speaker(s) 614.

III. Example Systems

In many situations, the network microphone device may be placed in proximity to a playback device 532-538. For instance, the playback device may be placed in the same room as a network microphone device making hearing of the content output difficult when audio content is being played back by a playback device. Embodiments described herein involve, inter alia, adjusting a volume for audio content played back by a playback system when content different from the audio content is output by a network microphone device or by the playback system.

FIGS. 7-8 present embodiments that can be implemented within the disclosed operating environment. Methods and the other process disclosed herein may include one or more operations, functions, or actions. Although the blocks are illustrated in sequential order, these blocks may also be performed in parallel, and/or in a different order than those described herein. Also, the various blocks may be combined into fewer blocks, divided into additional blocks, and/or removed based upon the desired implementation.

In addition, for the methods and other processes and methods disclosed herein, the flowchart shows functionality and operation of one possible implementation of present embodiments. In this regard, each block may represent a module, a segment, or a portion of program code, which includes one or more instructions executable by a processor for implementing specific logical functions or steps in the process. The program code may be stored on any type of computer readable medium, for example, such as a storage device including a disk or hard drive. The computer readable medium may include non-transitory computer readable medium, for example, such as computer-readable media that stores data for short periods of time like register memory, processor cache and Random Access Memory (RAM). The computer readable medium may also include non-transitory media, such as secondary or persistent long term storage, like read only memory (ROM), optical or magnetic disks, compact-disc read only memory (CD-ROM), for example. The computer readable media may also be any other volatile or non-volatile storage systems. The computer readable medium may be considered a computer readable storage medium, for example, or a tangible storage device. In addition, each block in the figures may represent circuitry that is wired to perform the specific logical functions in the process.

FIG. 7 is a flow chart of functions performed to enable the content output by a network microphone device to be heard while a playback device is also playing back audio content. In some examples, one or more of these functions described may be performed by a playback device. In other example, computing device such as 504-508 may also perform one or more of these functions in conjunction with the playback device or instead of the playback device. The computing device may be associated with a playback device and perform processing associated with the playback device.

At 702, a message may be received. The message may be associated with a network microphone device. The message may be received from a network microphone device via the communication network 546. Alternatively, the message may be received from a computing device, e.g., 504-508, associated with the network microphone device via communication link 544, 546. Other arrangements are also possible.

The message may be indicative of content to be output by the network microphone device, determined by the network microphone device to be output, and/or determined by the computing device associated with the network microphone device to be output (herein referred to collectively as NMD content). The NMD content may take a variety of forms, examples of which may include voice output, speech, music, a tone, or an alarm. The message may specify that the network microphone device may output content at a particular time defined by a clock reference in common with the playback device and the network microphone device. The message may also specify a duration of the content output by the network microphone device. Other arrangements are also possible for indicating when the network microphone device may output content.

The message may be sent to one or more of the playback devices in the playback system. In some instances, the message may be sent to all of the playback devices in the media playback system. In another example, the message may be sent to a subset of the playback devices. The subset of the playback devices may be based on whether a network microphone device is in the same zone or zones with the playback device.

Additionally, or alternatively, the subset of the playback devices may be based on whether the network microphone device is bonded with the playback device. The bond may indicate that the playback device and the network microphone device are in close proximity to each other, such as in a same room or zone or playing audio content in synchrony. In this regard, these playback devices may directly impact whether the NMD content can be heard over music, for instance, being played by the playback devices.

In some examples, the bonded playback device and network microphone device may use various networking techniques to reduce the latency between themselves. For example, a local rather than WAN network connection (LAN or Bluetooth) may be used for communication. As another example, communications might revert to a different frequency range in the local network, e.g., switch from a “typical” 2.4 Ghz communication to a 5 Ghz communication while the playback device is bonded to the network microphone device. As yet another example, communications might switch to a reserved channel on either the 2.4 or 5 Ghz spectrum or other network traffic may be reduced when the playback device and network microphone device is bonded, e.g., the playback device might stop serving as a relay node for other network traffic. Other arrangements are also possible.

At 704, the playback device may adjust, e.g., decrease its volume, at the time specified in the message to a level below that of a volume that the network microphone device would use when it outputs content. The volume may be specified in the message received by the playback device or the volume may be already predefined by the playback device. The volume may be reduced for a period of time defined by the duration of the NMD content. The purpose for decreasing the volume may be so that a listener may be able to better hear the content output by the network microphone device while audio content continues to play on the playback device. The process of decreasing volume of audio content as compared to NMD content is known as ducking.

As an example, consider a media playback system with a playback device in a kitchen and in the bedroom and a network microphone device is located in the kitchen. The kitchen playback device may be bonded with the network microphone device. The kitchen playback device and the bedroom playback device may be playing back audio. The bonding may result in the kitchen playback device being ducked but not the bedroom playback device when the network microphone device outputs content.

As another example, all of the playback devices may be in different zones. But the environment in which the playback devices is operating in may be an open area such as a living room and dining room combo space having a living room zone and a dining room zone. In this case, the network microphone device may be aware of the nature of the area (perhaps when the network microphone device was configured). In this case, all of the playback devices may be ducked because the content output by the network microphone device may otherwise be still difficult to hear in the open area.

At 706, the playback device may then restore a volume of audio content being played back. The volume may be restored, for instance, after the content is output by the network microphone device. The message sent by the network microphone device may indicate a duration of the NMD content. In this regard, the playback device may be able to determine that the NMD content has been output and then restore a volume of the audio content being played back. Alternatively, the network microphone device may send a message to the playback device when the playback device is to restore the volume of audio content rather than the playback device making this determination. In some embodiments, the playback device may store the volume of the content being played back prior to adjustment at 704 so that the volume can be restored.

Instead of or in addition to the network microphone device outputting audio content, the media playback system may output the NMD content. In this case, the network microphone device might not output the NMD content or might output the NMD content in conjunction with the playback device. FIG. 8 is a flow chart of functions that may be performed in playing audio content as well as outputting the NMD content. In some examples, one or more of the functions described may be performed by a playback device. In other example, computing device such as 504-508 may also perform one or more of these functions in conjunction with the playback device or instead of the playback device. The computing device associated with the playback device may perform processing associated with the playback device.

At 802, a message may be received. The message may be associated with a network microphone device and come from the network microphone device or from a computing device associated with the network microphone device. The message may be received from a network microphone device via the communication network 546. Alternatively, the message may be received from a computing device, e.g., 504-508, associated with the network microphone device via communication link 544. Other arrangements are also possible.

The message may include an indication of NMD content. The indication may be an audio file which defines the content output. For example, the audio file may include digital samples representative of the NMD content. The message may be sent to the playback device that is bonded to the network microphone device and/or all of the playback devices in the media playback system.

The NMD content output on the playback device may be handled in a variety of ways. As one example, at 804, the playback device may be arranged to mix the NMD content with the audio content being played by the playback device, e.g., a song. The playback device may play back audio content at a fixed sample rate. The playback device may mix the audio content with the NMD content by reducing the sampling rate of the audio content and the sample rate of the NMD content so that the playback device may be able to still play back the mixed audio content and NMD output at a same fixed sample rate. During this mixing process, the volume of the audio content and/or NMD content may be adjusted to facilitate hearing the NMD content on the playback device.

As another example, at 806, the audio content being played back on the playback device may be muted and the NMD content may be output on the playback device. If there are other playback devices 502 also playing the same audio content in synchrony, those playback devices 502 may continue to play back the audio content. When the playback device is done outputting the NMD content, the the playback device may continue to play back the audio content in synchrony with the other playback devices. For instance, a left channel of a speaker may mute and output NMD content and a right channel may continue to play the audio content. The playback device may be able to then continue to play back the audio content by using presentation time stamps in the audio content. The presentation timestamp may indicate timing of playback of the audio content. Based on when the NMD content is output by the playback device and a duration of the NMD content output, the playback device may be able to determine using the presentation time stamps the audio content to start playing after the NMD content is output. During this process, the volume of the audio content and/or NMD content output may be adjusted to facilitate hearing the NMD content output on the media playback system.

As yet another example, at 808, the audio content being played back on the playback device may be paused and the NMD content may be output on a playback device. When the playback device is released from paused, the audio content may be played back at the point where the playback device left off playback. In this case, any other playback devices 502 also playing the audio content in synchrony when the playback device outputs the NMD content may be paused. Again, during this process, the volume of the audio content and/or NMD content output may be adjusted to facilitate hearing the NMD content output on the media playback system.

As noted above, the NMD content output by the playback device may be at a baseline volume. This may be an appropriate volume that may have been previously set for the playback device or indicated in a message by the network microphone device. In some embodiments, the volume of the NMD content output and/or audio content output by the playback device may be adaptively adjusted.

For example, the volume of the NMD content output may be adjusted relative to the volume of the audio content played back by the playback device before and after ducking with respect to the baseline volume. The volume of the NMD content output may be decreased substantially from the baseline volume when the volume of the audio content is ducked substantially. On the other hand, the volume of the NMD content output may change slightly from the baseline volume if the volume of the audio content played back by the playback device is changed slightly. Similarly, the volume of the audio content may be adjusted relative to the volume of the NMD content.

If the network microphone device is outputting the content, then the playback device may send an indication of the determined volume of the NMD content to the network microphone device so that the network microphone device may output the NMD content at that volume. Alternatively, the playback device may send an indication of the volume of the audio content played by the playback device (either before or after ducking) during when the NMD content is output so that the network microphone device may determine the volume of the NMD content output. Other arrangements are also possible.

Accordingly, if the audio content being played back by the playback device is already loud, then the NMD content output may not be loud. Similarly, if the audio content being played back is already soft, then NMD content output may not be soft. Still further, in some embodiments, the playback device or network microphone device might not adjust the volume of the audio content or the volume of the NMD content at all. The volumes may be acceptable such that adjustment is not needed.

Methods and the other process disclosed herein may include one or more operations, functions, or actions. Although the blocks are illustrated in sequential order, these blocks may also be performed in parallel, and/or in a different order than those described herein. Also, the various blocks may be combined into fewer blocks, divided into additional blocks, and/or removed based upon the desired implementation.

In addition, for the methods and other processes and methods disclosed herein, the flowchart shows functionality and operation of one possible implementation of present embodiments. In this regard, each block may represent a module, a segment, or a portion of program code, which includes one or more instructions executable by a processor for implementing specific logical functions or steps in the process. The program code may be stored on any type of computer readable medium, for example, such as a storage device including a disk or hard drive. The computer readable medium may include non-transitory computer readable medium, for example, such as computer-readable media that stores data for short periods of time like register memory, processor cache and Random Access Memory (RAM). The computer readable medium may also include non-transitory media, such as secondary or persistent long term storage, like read only memory (ROM), optical or magnetic disks, compact-disc read only memory (CD-ROM), for example. The computer readable media may also be any other volatile or non-volatile storage systems. The computer readable medium may be considered a computer readable storage medium, for example, or a tangible storage device. In addition, each block in the figures may represent circuitry that is wired to perform the specific logical functions in the process.

IV. Conclusion

The description above discloses, among other things, various example systems, methods, apparatus, and articles of manufacture including, among other components, firmware and/or software executed on hardware. It is understood that such examples are merely illustrative and should not be considered as limiting. For example, it is contemplated that any or all of the firmware, hardware, and/or software aspects or components can be embodied exclusively in hardware, exclusively in software, exclusively in firmware, or in any combination of hardware, software, and/or firmware. Accordingly, the examples provided are not the only way(s) to implement such systems, methods, apparatus, and/or articles of manufacture.

Additionally, references herein to “embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one example embodiment of an invention. The appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. As such, the embodiments described herein, explicitly and implicitly understood by one skilled in the art, can be combined with other embodiments.

The specification is presented largely in terms of illustrative environments, systems, procedures, steps, logic blocks, processing, and other symbolic representations that directly or indirectly resemble the operations of data processing devices coupled to networks. These process descriptions and representations are typically used by those skilled in the art to most effectively convey the substance of their work to others skilled in the art. Numerous specific details are set forth to provide a thorough understanding of the present disclosure. However, it is understood to those skilled in the art that certain embodiments of the present disclosure can be practiced without certain, specific details. In other instances, well known methods, procedures, components, and circuitry have not been described in detail to avoid unnecessarily obscuring aspects of the embodiments. Accordingly, the scope of the present disclosure is defined by the appended claims rather than the forgoing description of embodiments.

When any of the appended claims are read to cover a purely software and/or firmware implementation, at least one of the elements in at least one example is hereby expressly defined to include a tangible, non-transitory medium such as a memory, DVD, CD, Blu-ray, and so on, storing the software and/or firmware. 

We claim:
 1. A first playback device comprising: a network interface; at least one processor; a non-transitory computer-readable medium; and program instructions stored on the non-transitory computer-readable medium that are executable by the at least one processor such that the first playback device is configured to: play back first audio content in synchrony with a second playback device; receive, via the network interface, a message indicating second audio content to be output by the first playback device; and in response to receiving the message indicating the second audio content: cease playing back the first audio content in synchrony with the second playback device; play back the second audio content while the second playback device plays back the first audio content; and after playing back the second audio content, resume playing back the first audio content in synchrony with the second playback device.
 2. The first playback device of claim 1, wherein the program instructions that are executable by the at least one processor such that the first playback device is configured to play back the first audio content in synchrony with the second playback device comprise program instructions that are executable by the at least one processor such that the first playback device is configured to play back the first audio content in synchrony with the second playback device at a first volume, and wherein the first playback device further comprises program instructions stored on the non-transitory computer-readable medium that are executable by the at least one processor such that the first playback device is configured to: while playing back the second audio content, cause the second playback device to play back the first audio content at a second volume.
 3. The first playback device of claim 2, wherein the program instructions that are executable by the at least one processor such that the first playback device is configured to resume playing back the first audio content in synchrony with the second playback device comprise program instructions that are executable by the at least one processor such that the first playback device is configured to cause the second playback device to play back the first audio content at the first volume.
 4. The first playback device of claim 2, wherein the second volume is lower than the first volume.
 5. The first playback device of claim 1, wherein the program instructions that are executable by the at least one processor such that the first playback device is configured to play back the first audio content in synchrony with the second playback device comprise program instructions that are executable by the at least one processor such that the first playback device is configured to play back the first audio content in synchrony with the second playback device at a first volume, and wherein the program instructions that are executable by the at least one processor such that the first playback device is configured to play back the second audio content while the second playback device plays back the first audio content comprise program instructions that are executable by the at least one processor such that the first playback device is configured to play back the second audio content at a second volume, wherein the second volume is higher than the first volume.
 6. The first playback device of claim 5, wherein the program instructions that are executable by the at least one processor such that the first playback device is configured to resume playing back the first audio content in synchrony with the second playback device comprise program instructions that are executable by the at least one processor such that the first playback device is configured to play back the first audio content at the first volume.
 7. The first playback device of claim 1, wherein the program instructions that are executable by the at least one processor such that the first playback device is configured to resume playing back the first audio content in synchrony with the second playback device comprise program instructions that are executable by the at least one processor such that the first playback device is configured to: determine a time at which to rejoin playing back the first audio content in synchrony with the second playback device based on a duration of the second audio content and playback timing of the first audio content; and at the determined time, resume playing back the first audio content in synchrony with the second playback device.
 8. The first playback device of claim 1, wherein the first playback device and the second playback device are bonded playback devices.
 9. The first playback device of claim 1, wherein the first playback device is configured to play back a left channel of the first audio content, and wherein the second playback device is configured to play back a right channel of the first audio content.
 10. A non-transitory computer-readable medium comprising program instructions stored thereon that are executable by at least one processor such that a first playback device is configured to: play back first audio content in synchrony with a second playback device; receive, via a network interface, a message indicating second audio content to be output by the first playback device; and in response to receiving the message indicating the second audio content: cease playing back the first audio content in synchrony with the second playback device; play back the second audio content while the second playback device plays back the first audio content; and after playing back the second audio content, resume playing back the first audio content in synchrony with the second playback device.
 11. The computer-readable medium of claim 10, wherein the program instructions that are executable by the at least one processor such that the first playback device is configured to play back the first audio content in synchrony with the second playback device comprise program instructions that are executable by the at least one processor such that the first playback device is configured to play back the first audio content in synchrony with the second playback device at a first volume, and wherein the first playback device further comprises program instructions stored on the non-transitory computer-readable medium that are executable by the at least one processor such that the first playback device is configured to: while playing back the second audio content, cause the second playback device to play back the first audio content at a second volume.
 12. The computer-readable medium of claim 11, wherein the program instructions that are executable by the at least one processor such that the first playback device is configured to resume playing back the first audio content in synchrony with the second playback device comprise program instructions that are executable by the at least one processor such that the first playback device is configured to cause the second playback device to play back the first audio content at the first volume.
 13. The computer-readable medium of claim 11, wherein the second volume is lower than the first volume.
 14. The computer-readable medium of claim 10, wherein the program instructions that are executable by the at least one processor such that the first playback device is configured to play back the first audio content in synchrony with the second playback device comprise program instructions that are executable by the at least one processor such that the first playback device is configured to play back the first audio content in synchrony with the second playback device at a first volume, and wherein the program instructions that are executable by the at least one processor such that the first playback device is configured to play back the second audio content while the second playback device plays back the first audio content comprise program instructions that are executable by the at least one processor such that the first playback device is configured to play back the second audio content at a second volume, wherein the second volume is higher than the first volume.
 15. The computer-readable medium of claim 14, wherein the program instructions that are executable by the at least one processor such that the first playback device is configured to resume playing back the first audio content in synchrony with the second playback device comprise program instructions that are executable by the at least one processor such that the first playback device is configured to play back the first audio content at the first volume.
 16. The computer-readable medium of claim 10, wherein the program instructions that are executable by the at least one processor such that the first playback device is configured to resume playing back the first audio content in synchrony with the second playback device comprise program instructions that are executable by the at least one processor such that the first playback device is configured to: determine a time at which to rejoin playing back the first audio content in synchrony with the second playback device based on a duration of the second audio content and playback timing of the first audio content; and at the determined time, resume playing back the first audio content in synchrony with the second playback device.
 17. The computer-readable medium of claim 10, wherein the first playback device is configured to play back a left channel of the first audio content, and wherein the second playback device is configured to play back a right channel of the first audio content.
 18. A method comprising: playing back, by a first playback device, first audio content in synchrony with a second playback device; receiving, by the first playback device, a message indicating second audio content to be output by the first playback device; and in response to receiving the message indicating the second audio content: ceasing, by the first playback device, playing back the first audio content in synchrony with the second playback device; playing back, by the first playback device, the second audio content while the second playback device plays back the first audio content; and after playing back the second audio content, resuming, by the first playback device, playing back the first audio content in synchrony with the second playback device.
 19. The method of claim 18, wherein playing back, by the first playback device, the first audio content in synchrony with the second playback device comprises playing back, by the first playback device, the first audio content in synchrony with the second playback device at a first volume, and wherein the method further comprises: while playing back the second audio content, causing, by the first playback device, the second playback device to play back the first audio content at a second volume.
 20. The method of claim 19, wherein resuming, by the first playback device, playing back the first audio content in synchrony with the second playback device comprises causing, by the first playback device, the second playback device to play back the first audio content at the first volume. 